I was thrown in at the deep end as a callow youth, giving P.T's form the age of 21. My very first one was the old 55minute long one, and an "away" talk at that, not only that, I was told I had got the dates wrong, ( actually I was mis-informed), and had to prepare it from scratch in the morning, and deliver it in the Afternoon.
A Baptism of Fire indeed !
I gradually honed my skills, I believed, as another poster above, that I should be a master of my subject, and that I should present something new and stimulating to my audience, I felt I owed it to them, they had made the effort to come and listen , the least I could do was give them something worth listening to.
This involved lots of research outside of JW/WT dry as a bone stuff. Bible Commentaries were used so I really knew what the Bible was saying in a particular verse or section,and I would read many books on the subject in hand.
I do have to say, that because I did such a dedicated and thorough job, all the Congregations I gave talks at loved it, and I was asked back many times. I was never an Elder, just a M.S, so this was unusual.
I have to say that the accolades I got did massage my ego, I enjoyed the showmanship bit, and the letters of thanks that were sent back to my Congregation were more ego inflating.
In the end though, as I gradually realised that the WT were full of s**t, I couldn't find an outline that I could deliver without changing 99% of it, at that point I refused to give any more P.Ts.